"Generation failed" - DC build failed!

Question

Hi,
    I have two DCs: Comp A and Comp B. If I build Comp A or Comp B it's OK !
If I import comp B public part into compA and I build comp A it's OK!
If I add in used web dynpro component of comp A, a component of comp B and I build comp A, the build fails.
I already tried to import other components into CompA or to import Comp B into other components and I havent't any problems in these cases!
The Error log is:
   [echo] Starting WebDynpro generator
     [wdgen]
[wdgen] [Info]    Generating configuration/Components/g008gestportammterrbizcomppkg.G008GestPortAmmTerrBizComp/G008GestPortAmmTerrBizComp.xml
     [wdgen] [Info]    Generating packages/g008gestportammterrbizcomppkg/wdp/ResourceG008GestPortAmmTerrBizComp.properties
     [wdgen] [Info]    Generating packages/g008gestportammterrbizcomppkg/wdp/ResourceG008GestPortAmmTerrBizComp_it.properties
     [wdgen] [Info]    Catching throwable null
     [wdgen] [Info]    java.lang.NullPointerException
     [wdgen]      at com.sap.ide.webdynpro.generation.util.viewset.ServiceViewSetGeneration.cleanTemplateViewInstances(ServiceViewSetGeneration.java:161)
     [wdgen]      at com.sap.ide.webdynpro.generation.util.viewset.ServiceViewSetGeneration.cleanTemplateViewInstances(ServiceViewSetGeneration.java:111)
     [wdgen]      at com.sap.ide.webdynpro.generation.Generation.undoTransientGenerationForWindowsViewsetsToViews(Generation.java:625)
     [wdgen]      at com.sap.ide.webdynpro.generation.Generation.doPersistentGenerationForComponentRecursivly(Generation.java:1779)
     [wdgen]      at com.sap.ide.webdynpro.generation.Generation.doPersistentGenerationForComponentRecursivly(Generation.java:1736)
     [wdgen]      at com.sap.ide.webdynpro.generation.Generation.generatePersistentArchive(Generation.java:1610)
     [wdgen]      at com.sap.ide.webdynpro.generation.console.GenerationConsole.generate(GenerationConsole.java:215)
     [wdgen]      at com.sap.webdynpro.generation.ant.GenerationAnt.main(GenerationAnt.java:50)
     [wdgen]      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     [wdgen]      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     [wdgen]      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     [wdgen]      at java.lang.reflect.Method.invoke(Method.java:324)
     [wdgen]      at com.sap.webdynpro.generation.ant.WDGenAntTask.execute(WDGenAntTask.java:219)
     [wdgen]      at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)
     [wdgen]      at org.apache.tools.ant.Task.perform(Task.java:364)
     [wdgen]      at org.apache.tools.ant.Target.execute(Target.java:341)
     [wdgen]      at org.apache.tools.ant.Target.performTasks(Target.java:369)
     [wdgen]      at org.apache.tools.ant.Project.executeTarget(Project.java:1214)
     [wdgen]      at com.sap.tc.buildplugin.techdev.ant.util.AntRunner.run(AntRunner.java:111)
     [wdgen]      at com.sap.tc.buildplugin.DefaultAntBuildAction.execute(DefaultAntBuildAction.java:62)
     [wdgen]      at com.sap.tc.buildplugin.AbstractPlugin.handleBuildStepSequence(AbstractPlugin.java:222)
     [wdgen]      at com.sap.tc.buildplugin.AbstractPlugin.performBuild(AbstractPlugin.java:199)
     [wdgen]      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     [wdgen]      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     [wdgen]      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     [wdgen]      at java.lang.reflect.Method.invoke(Method.java:324)
     [wdgen]      at com.sap.tc.buildtool.PluginCommunicator.maybeInvoke(PluginCommunicator.java:114)
     [wdgen]      at com.sap.tc.buildtool.PluginCommunicatorV2.communicate(PluginCommunicatorV2.java:42)
     [wdgen]      at com.sap.tc.buildtool.PluginHandlerImpl.handlePluginCommunication(PluginHandlerImpl.java:354)
     [wdgen]      at com.sap.tc.buildtool.PluginHandlerImpl.execute(PluginHandlerImpl.java:176)
     [wdgen]      at com.sap.tc.devconf.impl.DCProxy.make(DCProxy.java:1723)
     [wdgen]      at com.sap.tc.devconf.impl.DCProxy.make(DCProxy.java:5615)
     [wdgen]      at com.sap.ide.eclipse.component.provider.actions.dcproject.BuildAction.buildDCsForDevConfig(BuildAction.java:307)
     [wdgen]      at com.sap.ide.eclipse.component.provider.actions.dcproject.BuildAction.access$200(BuildAction.java:58)
     [wdgen]      at com.sap.ide.eclipse.component.provider.actions.dcproject.BuildAction$1.run(BuildAction.java:212)
     [wdgen]      at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:101)
     [wdgen] ERROR: Unknown exception during generation null (java.lang.NullPointerException)
     [wdgen] ERROR: Generation failed due to errors (8 seconds)
Ant runtime 26.782 seconds
Ant build finished with ERRORS
[Error]   Generation failed!
Error: Build stopped due to an error: [Error]   Generation failed!
Build plugin finished at 2007-08-02 15:02:52 GMT+01:00 (CEST)
Total build plugin runtime: 28.844 seconds
Build finished with ERROR
Someone can help me?
Best Regards

Answer 1

Hello Frattini
The error stack clearly mentions existence of a null pointer. I think, you should check for null pointer in comp B, most probably it must be in the wdDoInit of that comp. Also, thoroughly check comp B for any errors that you must be ignoring.
I hope this helps you.
Regards
Kapil